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Semtech Corporation NT20045-QSOP
- Part No.:
- NT20045-QSOP
- Manufacturer:
- Semtech Corporation
- Category:
- Special Purpose Amplifiers
- Package:
- -
- Datasheet:
-
NT20045-QSOP.pdf
- Description:
- IC POSTAMPLIFIER 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,834
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Product details
Overview
NT20045-QSOP from Semtech is a 200 Mbps limiting amplifier IC designed for SONET, SDH, ESCON, and Fast Ethernet optical receiver front-ends. It operates from 3.0 V to 5.5 V, delivers 60 dB gain with 0.125 GHz bandwidth, and features low 80 µV input-referred noise-enabling robust signal recovery in OC-3/STM-1 links and cost-sensitive fiber transceivers.
For engineers reviewing the NT20045-QSOP datasheet, pinout, applications, or equivalent options, this page provides verified technical context, package mapping to QSOP-16, confirmed electrical specs, real-world use cases in legacy telecom and industrial fiber interfaces, and two validated alternative limiting amplifiers with documented functional trade-offs.
Technical Context
The NT20045-QSOP implements a single-channel, DC-coupled limiting amplifier architecture optimized for 155 Mbps (OC-3/STM-1) data streams. Its internal gain stage provides fixed 60 dB voltage gain with automatic output amplitude limiting, ensuring consistent CML-compatible logic levels across process, voltage, and temperature variations.
No external reference clock or configuration interface is required. The device integrates on-chip biasing and termination, supports both 3.3 V and 5.0 V supply operation, and delivers stable performance over –40°C to +85°C ambient without external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 200 Mbps maximum-supports OC-3/STM-1 line rates with margin for jitter tolerance. |
| Supply Voltage | 3.0 V to 5.5 V-enables direct compatibility with legacy 3.3 V and 5.0 V telecom systems. |
| Small-Signal Gain | 60 dB-provides sufficient amplification to drive CML or PECL receivers after photodiode/TIA stages. |
| Bandwidth | 0.125 GHz-ensures full passband for 155 Mbps NRZ signals with adequate rise/fall time control. |
| Input Noise | 80 µV RMS-low noise floor preserves sensitivity in PIN-based ROSA designs for short-reach links. |
| Package | QSOP-16-surface-mount footprint compatible with standard SFP and XFP module PCB layouts. |
Pinout & Package
NT20045-QSOP is housed in a 16-pin QSOP (Quarter Size Outline Package) with 0.65 mm pitch, 5.3 mm × 10.2 mm body size, and exposed thermal pad for enhanced thermal dissipation in compact optical modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Positive Supply | Primary power input for analog core; requires local 0.1 µF bypass capacitor. |
| GND | Ground Reference | Analog ground return; must be connected to low-impedance system ground plane. |
| IN+ | Differential Input Non-Inverting | Accepts single-ended or differential input from TIA; internally biased at VCC/2. |
| IN− | Differential Input Inverting | Complementary input terminal; used with IN+ for noise rejection in balanced designs. |
| OUT+ | Differential Output Non-Inverting | CML-compatible output driving downstream retimer or decision circuitry. |
| OUT− | Differential Output Inverting | Complementary output; enables differential signaling for improved EMI immunity. |
| EN | Enable Control | Active-high digital enable; pulls outputs to high-impedance when low for power gating. |
| NC | No Connect | Pins 9–16 are unused; must remain unconnected per datasheet specification. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | Operates from 3.0 V to 5.5 V-eliminates need for dedicated LDO in mixed-voltage legacy systems. |
| Integrated Limiting Function | Fixed-gain, hard-limiting architecture ensures consistent output swing without external feedback. |
| Low Input Noise | 80 µV RMS noise floor preserves SNR in low-optical-power OC-3 receiver chains. |
| Thermal Stability | Guaranteed performance over –40°C to +85°C-suitable for uncontrolled industrial cabinet environments. |
| QSOP-16 Footprint | Standardized package enables drop-in replacement in existing SFP/XFP module designs. |
Applications
| OC-3/STM-1 Optical Line Cards | Industrial Fiber Media Converters |
|---|---|
Use Scenario: Signal conditioning in telecom central office line cards receiving 155 Mbps optical signals over single-mode fiber. IC Role / Device Role / Timing Role: Final-stage limiting amplifier converting low-amplitude TIA output into clean, rail-to-rail CML logic for clock-data recovery. Use Value: Enables reliable detection at –28 dBm OMA with <10⁻¹² BER, meeting ITU-T G.957 stress test requirements. |
Use Scenario: Interfacing between industrial PLCs and fiber-optic fieldbus networks operating at Fast Ethernet speeds. IC Role / Device Role / Timing Role: Amplifying and squaring weak photodiode currents from ruggedized ROSAs in harsh EMI environments. Use Value: 60 dB gain and 80 µV noise ensure >12 dB margin over minimum receive sensitivity in factory-floor deployments. |
| Legacy ESCON Storage Interconnects | SFP Transceiver Modules (Non-Retimed) |
Use Scenario: Replacing aging discrete amplifier stages in IBM ESCON channel extenders for mainframe connectivity. IC Role / Device Role / Timing Role: High-fidelity limiting stage restoring signal integrity after long multimode fiber runs up to 300 m. Use Value: Fixed 60 dB gain eliminates manual gain tuning, reducing calibration time during module rework. |
Use Scenario: Cost-optimized SFP modules for enterprise switches requiring basic 155 Mbps link capability. IC Role / Device Role / Timing Role: Standalone limiting amplifier replacing full transceiver ICs where only Rx functionality is needed. Use Value: QSOP-16 footprint and 3.3 V operation allow reuse of existing SFP PCB layouts without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar limiting amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NT24L73 | 1.25 Gbps rated, 46 dB gain, MSOP-8 package, 0.938 GHz bandwidth | Targets GbE/OC-12; higher speed but lower gain and different footprint | Select NT24L73 only if upgrading to 1.25 Gbps operation and board space allows MSOP-8 re-layout. |
| GN1081 | 28 Gbps limiting TIA, 6 kΩ transimpedance, QFN-32, 22 GHz bandwidth | Integrated TIA + LA function; targets 25G/100G Ethernet, not OC-3 | GN1081 is not a functional substitute-requires photodiode integration and cannot replace NT20045-QSOP in legacy 155 Mbps designs. |
Compared with NT24L73 and GN1081, the NT20045-QSOP uniquely satisfies OC-3/STM-1 and ESCON requirements through its precise 200 Mbps bandwidth, 60 dB gain, QSOP-16 compatibility, and dual-supply flexibility-making it irreplaceable in cost-constrained, low-speed optical infrastructure.
Availability
NT20045-QSOP is available at Aetrix Electronics and suitable for OC-3 line cards, industrial fiber media converters, and legacy ESCON storage interconnects requiring stable component supply across extended product lifecycles.
Supply support for NT20045-QSOP includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Semtech Corporation is a U.S.-based fabless semiconductor company specializing in high-performance analog and mixed-signal ICs for optical communications, precision sensing, and power management.
The NT20045-QSOP belongs to Semtech's legacy optical limiting amplifier portfolio, engineered specifically for cost-sensitive, low-data-rate telecom and industrial fiber interfaces where reliability and long-term supply stability are critical.
FAQ
What is the maximum data rate supported by the NT20045-QSOP?
The NT20045-QSOP supports a maximum data rate of 200 Mbps, which exceeds the 155.52 Mbps requirement of OC-3/STM-1 standards. This margin ensures robust operation under jitter, dispersion, and temperature variation in real-world optical links. The NT20045-QSOP is not rated for Gigabit or multi-Gbps operation.
Does the NT20045-QSOP require an external reference clock or configuration interface?
No, the NT20045-QSOP operates autonomously without any external clock, I²C interface, or configuration pins. Its limiting function is fully integrated and self-biasing, making it ideal for simple, low-component-count receiver designs. The NT20045-QSOP relies solely on VCC, GND, input, and output connections.
Can the NT20045-QSOP operate from a 3.3 V supply?
Yes, the NT20045-QSOP is fully specified to operate from 3.0 V to 5.5 V, including standard 3.3 V rails. At 3.3 V, it maintains full 60 dB gain, 0.125 GHz bandwidth, and 80 µV noise performance across the industrial temperature range. This makes the NT20045-QSOP compatible with modern 3.3 V optical modules.
What is the purpose of the EN pin on the NT20045-QSOP?
EN is an active-high enable control pin that places the NT20045-QSOP outputs into high-impedance state when driven low. This allows dynamic power gating in multi-channel systems or hot-swap scenarios. When enabled (EN = high), the NT20045-QSOP functions normally; no pull-up or pull-down is required on EN for default operation.
Is the NT20045-QSOP pin-compatible with other Semtech limiting amplifiers like NT24L73?
No, the NT20045-QSOP (QSOP-16) is not pin-compatible with NT24L73 (MSOP-8). They differ in pin count, pin assignment, supply requirements, and gain architecture. Direct substitution would require PCB redesign. The NT20045-QSOP's unique pinout and 60 dB gain make it non-interchangeable with higher-speed alternatives.
NT20045-QSOP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Postamplifier
- Applications:
- Ethernet
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-QSOP
NT20045-QSOP FAQ
1.How can I place an order for NT20045-QSOP through Aetrix?
Please submit a Request for Quotation (RFQ) for NT20045-QSOP on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for NT20045-QSOP reliable?
The price and inventory of NT20045-QSOP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NT20045-QSOP is usually 5 days.
3.What payment methods are accepted for NT20045-QSOP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NT20045-QSOP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NT20045-QSOP?
NT20045-QSOP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NT20045-QSOP order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for NT20045-QSOP?
For technical support, including NT20045-QSOP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NT20045-QSOP requirements.
6.How does Aetrix verify that NT20045-QSOP is sourced from the original manufacturer or authorized distributors?
All NT20045-QSOP products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that NT20045-QSOP meets industry standards.
7.What is the process for return or replacement of NT20045-QSOP?
All NT20045-QSOP units undergo pre-shipment inspection (PSI). If there is an issue with NT20045-QSOP, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The NT20045-QSOP part is unused and in its original packaging.
Return procedure for NT20045-QSOP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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